Abstract: Through the theoretical analysis of the impulse generated during the relieving process of the residual stress by the explosion,it is explained that at the same explosive parameters and the mode of distribution,the effect of the width of the strip on the residual stress relieving is larger than that of the thickness of the strip. At the same time,the relationship between the width of the strip and the thickness of the strip was determined,and the calculation formula of the width of the strip was given. Based on the indirect coupling of welding temperature field and stress field to solve the welding residual stress,the ANSYS/LS-DYNA nonlinear finite element analysis software was used to simulate the process of relieving residual stress at different explosives of different cross-section explosives. The results show that when the width of the strips is the same and more than twice the thickness of the explosive,as the thickness of the explosive increases,the impulse generated by the explosion does not change,and the level of welding residual stress is basically the same. When the thickness is the same,as the width of the explosive increases,the impulse generated by the explosion increases,and the level of welding residual stress is increased.